It was PIA Express Boeing 747-281B (registration AP-BIC) on lease from Air Universal.
PIA Express was short-lived low cost flight service launched on December 25, 2006, with this leased Boeing 747.
Flights were operated on Karachi-Lahore-Islamabad and Islamabad-Lahore-Karachi route without meals service. Only drinks were served on PIA Express flights.
Here's PIA Express service advertisement that appeared in December 23, 2006 newspaper.
And following photo of AP-BIC in PIA Express markings appeared in online edition of Urdu daily 'Express'.
Another photo of AP-BIC taken at Lahore Airport in January 2007. 'Destination Pakistan 2007' markings partially visible below cabin windows in this photo.